There are coups to choose cotton varieties

First of all, there must be a sense of security. For the selected cotton varieties, the first is to see whether they can adapt to the local climate. In general, the ecological conditions of temperature, light, water, and gas in the middle and lower reaches of the Yangtze River are similar. The cotton varieties in these areas can adapt to each other. It is worth noting that the cotton varieties that are not resistant to high temperatures should not be used; Disease resistance to insects. Mainly resistance to wilt and verticillium wilt, resistant to lepidopteran pests such as cotton bollworm, of course, the resistance is relative, there is no absolute resistance to disease resistant varieties; the third is to look at the potential for yield increase. Generally speaking, the yield is increased by 5%~10% compared with the varieties cultivated on a large area; the fourth is whether the cotton seeds have passed the examination and approval by the provincial or higher-level varieties approval committee or the local agricultural authorities; the fifth is to see if they have been tested and modeled in the local area; Is to see whether the local dealers have sold official invoices; seven is to see whether the seed business can carry out after-sale tracking services.
Second, pay attention to the seed germination rate. In recent years, the development of hybrid cotton in the mid-lower reaches of the Yangtze River has become very fast. However, the hybrid cotton production is mostly in the northern cotton area. The northern autumn cotton climate is very unfavorable to the maturity of the cotton varieties last year, so the maturity is poor and tender. Many seeds, the rate of healthy seeds is not high. Therefore, when selecting cotton seeds, special attention should be paid to the germination rate of cotton seeds. The price of hybrid cotton seeds is relatively high, about 55 yuan per acre, about 1 mu of land for a high germination rate, and low seed germination rates. Season, it is difficult to ensure the cotton field area. When buying seeds, pay attention to the germination rate of the cotton seeds. Generally, the germination rate should reach 80%, and the minimum must not be lower than 72%.
Third, be careful about purity. Authentic hybrid cotton has a purity of more than 96%. Below this purity, there is a problem with the quality of the cotton seed. First, the purity of the cross-breeding parent is not high; second, the hybrid cotton is mixed with other cotton seeds; A second-generation cotton seed is used as a first generation cotton seed; fourth, a conventional cotton seed may be used as a hybrid cotton seed. Impure species will greatly reduce the resistance to insects, and secondly, they will increase the amount of heterotypic plants in the field. Both yield and quality will be greatly affected.
Fourth, we must do a good job supporting the law. Different farmers have the same excellent cotton varieties, and their yields often differ greatly. This shows that there is a big difference in planting levels among households. This means that it is not enough to only purchase improved varieties, and it is also necessary to implement good measures. For example, it is necessary to reform planting methods and arrange reasonable density; to formulate scientifically, to balance fertilization and prevent premature senescence; to chemically regulate and prevent prosperous growth, and to promote stable and long growth of cotton; and to comprehensively prevent and control the pests to a minimum extent. .

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